Requested feature could make possible serverless decentralized peer-to-peer syncronization using external tool like Syncthing, BTSync, etc.
My user has its contacts stored locally in its Android phone.
DAVdroid is not soon installed.
Is it possible to use DAVdroid to export globally all its contact to a cardDAV (davical) server ?
And too, for its calDAV Calendar.
See https://www.davdroid.com/faq/existing-contacts-are-not-synced/ for more information and a video.
Does that help?
Yes, thank you, it helps very much !!
Is there a similar process for CalDAV ?
Thank you very much, I explore all that.